Tech. Sgt. Mark Graveline engages in some lively conversation during the Marine Corps Air Station Yuma Airshow March 17, 2012. During the airshow, Sergeant Graveline spent time educating airshow visitors about the aircraft, posing for photographs, signing autographs, and answering questions. More than 60,000 visitors attended the MCAS Yuma Airshow. Sergeant Graveline is a flying crew chief with the 315th Aircraft Maintenance Squadron at Joint Base Charleston, S.C. (U.S. Air Force photo/Staff Sgt. Shane Ellis)